A Practical Tax program

Program Target

This procedure is derived from a practice in C Primer Plus (fifth Edition).

　　

Our goal is to create a program that is user friendly and highly secure (preventing incorrect input). In accordance with the requirements of the book, we develop pseudo-code:

Subject:

　　Do Loop {

Prompt for type of rating

Judgment: Type. If it is not correct, the mark is 0

Prompt to enter amount

Judgment: Amount. If it is not correct, place the mark as 0{

Type 1: Call function output tax

Type 2: Call function output tax

Type 3: Call function Output tax

Type 4: Call function Output tax

}

Buffer adjustment

} Loop continuation condition (TAG)

function for output tax:

　If: Amount is specified below

Return: Amount * 0.15

Otherwise

Return: Regulation * 0.15 + (amount-provision) * 0.28

In order to make the interface more beautiful, we use a tab to prompt the user input, and the use of unbuffered input to achieve a certain effect, in detail, see the program code.

Program code

1#include <stdio.h>2#include <stdlib.h>3#include <conio.h>4 5 /*6 This procedure is in accordance with the 1988-year states Federal tax Schedule7 The plan is divided into four standard levies:8 single 178509 Head of household 23900Ten married Total 29750 One married divorced 14875 A each class is subject to a 15% tax in its scope, and more than the partial 28% calculation - */ -  the #defineALONE 17850.0 - #defineFam_man 23900.0 - #defineMa_tog 29750.0 - #defineMa_se 14875.0 +  - DoubleCalcDoubleMoneyDouble Base); +  A intMainintargcChar*argv[]) { at     Chartype; -     DoubleMoney ; -     intFlag =1;//Loop Marker -  -      Do{ -printf"┌─────────────┐\n" in                "│ Please select taxpayer Status: │\n" -                "│a. Single B. Head of household │\n" to                "│c. Married in total D. married divorced │\n" +                "│ Enter other content to exit │\n" -                "└─────────────┘\n" the                "user#[]\b\b"); *         //The following getche is a non-buffered input with ECHO, function prototype in Conio.h $         if((type = Getche ())! ='a'&& Type! ='b'&& Type! ='C'&& Type! ='D'){Panax NotoginsengFlag =0; -printf"\ n has exited! \ n"); the              Break; +         } A  theprintf"\ n Please enter total taxpayer property: $[]\b\b\b\b\b\b\b\b\b\b\b"); +         if(SCANF ("%LF",&Money )) { -             Switch(type) { $              Case 'a': $printf"the taxpayer needs to pay $%g taxes. \ n", Calc (Money, ALONE)); -                  Break; -              Case 'b': theprintf"the taxpayer needs to pay $%g taxes. \ n", Calc (Money, Fam_man)); -                  Break;Wuyi              Case 'C': theprintf"the taxpayer needs to pay $%g taxes. \ n", Calc (Money, Ma_tog)); -                  Break; Wu              Case 'D': -printf"the taxpayer needs to pay $%g taxes. \ n", Calc (Money, Ma_se)); About                  Break; $             } -         } -         Else{ -Flag =0; Aprintf"Data Error! \ n"); +         } the          while(GetChar ()! ='\ n');//adjusting the Read buffer -  $} while(flag); the  theprintf"\ n Thank you for using \ n"); the getch (); the  -     return 0; in } the  the DoubleCalcDoubleMoneyDouble Base){ About     return(Money <Base) ? (Money *0.15) : (Base*0.15+ (Money-Base) *0.28); the     //This function returns the correct amount of tax,? : the operator is concise and provides a memory tip: the     //is that true? Yes: no the}

Some code shows error correction:

Run results

A Practical Tax program